When you spend time with one who lives in the light full time, you start to perceive your own. And then there are the lightning bolts.  Shaktipat is like a lightning bolt.  The Guru infuses you with the Divine energy they live in.  It's not the Guru's energy.  It's God's energy but the Guru is God's agent, dispensing that energy wherever God says.  So when you receive this Divine energy, your gratitude goes to God.  Yet you wouldn't be receiving it so easily unless the Guru made it available, so your gratitude is to the Guru as well.  

Watch Gurudevi’s full discourse "Arise! Awake!" here